The heads are your bottleneck. They flow around 185 CFM in stock form. I would put the motor in the low 300's for horse power.
I would take the heads to a shop and have them open the intake valves up from 1.88 to 2.02. Minor port and bowl work to get rid of casting slag and gasket match the intake ports. Don't go nuts. You'll have a solid 350 HP when all is said and done.
Awesome sounds like a decent plan, I assume you are talking Hp at the crank. Ill price it out and hopefully its not too much compared to new heads. I dont feel like i need to spend another $2000+ dollars for new heads as i dont need the power in the car. I have a 1st gen ramcharger being bigger and heavier with 3.23 gears that im saving the the high HP build for that. I have a new 360 crate short block that i want to learn and build on before i dump it in the truck.
Sorry the other question i had was the rocker arms you originally recommended, do i not need them to be adjustable with that cam? i think the link you posted was not.